After entering the secret passage entrance, there is a staircase corridor that descends downward.

The width of the corridor allows for perhaps two Giant Wolves to walk side by side, the steps are spacious, and on each step is carved a fist-sized unknown rune.

The surrounding walls all show obvious signs of reinforcement. After descending the steps for a little more than a minute, large reliefs begin to appear on the walls on both sides. Zong Shen slows his pace, holding the [Magic Power Flashlight] to illuminate these reliefs.

These reliefs all depict scenes of demons; from the original chaos in the void, several gigantic Primordial Demons were born, suddenly enveloped by beams of light, in the next scene those demons appear on a desolate land, these demons hunt and enslave other races, gradually forming a Demon Race.

Zong Shen watches as he proceeds step by step, finally at the last scene of the reliefs, these demons have dominated the entire world, possessing a plethora of various types of demons, they gaze up at the sky, seeming to be waiting for something.

The entire relief depicts the growth of this Demon Race as it gradually strengthens, ultimately dominating the entire world.

Wherever they go, they are surrounded by sulfurous smoke, and the ghostly green flames can ignite everything, destroying all vitality.

The Demon Race has a unique racial system involving souls and will. Other races' creatures either voluntarily transform their souls or fall, otherwise, they cannot grasp Demon Power. Hence, besides the initial Primordial Great Demons, the demon lineage gradually diversified over time, with Flame Demons, Tree Demons, Stone Demons, Charm Demons…

These are the true demons, compared to Burrowing Demons which are monsters; they are more accurately Burrow Monsters with certain demon traits, their essential race still belonging more to Burrow Creatures.

On the relief, after the demons dominated the entire world, their development hit a bottleneck. Unless they could attract those chaotic energies from the void, demon development necessarily requires using other creatures as intermediaries for development.

In the last scene of the relief, all the demons are gazing at the sky, a dimensional passage spanning the heavens and earth appears, those demons seem to receive some message, starting to prepare, launching an attack on the other end of the dimensional passage, many Fear Demon Kings gather to summon Hellfire.

Countless demons surge forward after the hellfire, entering the dimensional passage.

These reliefs roughly document the birth and growth of the Blood-Burning Demon Race, up to the moment before the invasion of the Endless Continent.

The beams of light that suddenly appeared in the void to capture the Primordial Demons, inexplicably descending, are somewhat similar to the current emergence of the Lords.

Zong Shen withdraws his gaze, continuing to follow the team as they descend the large stone steps, advancing for another minute or so, the path suddenly opens up, revealing an extremely spacious and tall underground corridor.

The entrance they descended was actually just a side passage, the main path ahead is the main body of this underground secret passage, indicating that Blood-Burning Demons likely built numerous underground strongholds in the Burial Ground.

Their current position is at least several hundred meters deep underground.

Based on this construction standard, those Blood-Burning Demons seemingly intended to use this as a semi-permanent stronghold, yet now the entire continent is devoid of any trace of Blood-Burning Demons.

Whether due to a counterattack by the Indigenous People's alliance or other unknown reasons, the Blood-Burning Demons ultimately failed to completely seize control of the Endless Continent.

Furthermore, Zong Shen realizes that Blood-Burning Demons seem particularly enthusiastic about creating undead of the Undead Race.

The entire Burial Ground has nearly become a haven for the Undead Race, if a deranged person were to unearth the Burial Ground, they might release hundreds of thousands, if not millions, of undead monsters in an instant.

In essence, undead are different from the Demon Race, yet like the Burrowing Race, they and the Demon Race share many commonalities, such as soul characteristics, preferences, and living environments.

This is racial commonality, as similar commonalities exist among the Human Race, Elf Race, Dwarf Race, and Goblin Race, which is the fundamental reason why multiple races can collaborate.

Of course, besides producing large amounts of undead death qi and undead monsters, the Burial Ground can also hinder the rooting of War Ancient Trees, possessing many innate defensive advantages.

The team enters the spacious corridor, the entire corridor is a ten-meter-by-ten-meter square passage, sufficiently spacious to allow seven or eight warriors to advance side by side.

The walls on both sides are adorned with smooth, jade-like skulls.

As Zong Shen and the others step onto the passage, each skull lights up, with bright orange-red flames burning inside, serving as illumination for the passage.

The skulls vary in size, apparently the "trophies" of those Blood-Burning Demons, appearing to Zong Shen as a form of dark humor.

Skull flames illuminate the path ahead, and as far as the eye can see, a side passage appears every so often, along with various large and small rooms with different functions.

At the end of the corridor, several hundred meters away, is a hall, which should serve as a transit point for this passage.

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